JP2007177991A - Vibration damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping device having a novel structure, which effectively reduces abnormal sound when inputting vibration by preventing intrusion of water or oil into a section between overlapped faces of a first mounting member and a main body rubber elastic body. <P>SOLUTION: This vibration damping device is provided with a seal lip 86 which protrudes from a side of at least either of the first mounting member 12 and the main body rubber elastic body 16, and extends continuously over the whole periphery in the peripheral direction in outer peripheral parts of the overlapped faces 26, 66 of the first mounting member 12 and the main body rubber elastic body 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an anti-vibration device arranged between members to be anti-vibrated, and in particular, the first mounting member is arranged so as to be separable in the axial direction with respect to the main rubber elastic body. The present invention relates to a vibration isolator provided with a stopper mechanism that limits the relative displacement amount of a first mounting member and a second mounting member when a large load is input.

  Conventionally, as a type of vibration isolator which is interposed between both members to be vibration-proofed or supported to be anti-vibrated and supports both members for vibration-proof connection or anti-vibration, the first mounting bracket and the second There is known a vibration isolator in which a mounting bracket is elastically connected via a main rubber elastic body. For example, it is shown in patent document 1 (Unexamined-Japanese-Patent No. 9-89037).

  In such an anti-vibration device, the relative displacement in the separation direction (rebound direction) of the first mounting bracket and the second mounting bracket is limited, and excessive elastic deformation of the main rubber elastic body is mainly suppressed. For this purpose, a rebound stopper mechanism is provided. However, even if such a rebound stopper mechanism is provided, it may be difficult to sufficiently limit the relative displacement between the first mounting bracket and the second mounting bracket depending on the magnitude of the input load, etc. The excessive deformation of the elastic body is difficult to be suppressed, and there is a problem that durability is lowered.

  Therefore, in order to cope with the above-described problem, a vibration isolator having a new structure has been proposed. Such an anti-vibration device is, as shown in Patent Document 2 (Japanese Patent Laid-Open No. 2005-23972) and Patent Document 3 (Japanese Patent Laid-Open No. 2005-23973), of a main rubber elastic body having a truncated cone shape. The second mounting bracket is fixed to the outer peripheral surface of the large-diameter side end, and the first mounting bracket is superposed on the small-diameter side end surface of the main rubber elastic body. Can be separated from the main rubber elastic body in the axial direction. As a result, when the rebound load is input, the first mounting bracket and the main rubber elastic body are relatively separated from each other, and the tensile stress of the main rubber elastic body is reduced, thereby improving the durability of the main rubber elastic body. The

  However, in the vibration isolator having the above-described structure, there is a risk that water, oil, or the like may invade between the overlapping surfaces of the first mounting bracket and the main rubber elastic body. There was a problem that occurred.

JP-A-9-89037 JP-A-2005-23972 JP 2005-23973 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is water, oil, etc. between the overlapping surface of the first mounting member and the main rubber elastic body. An object of the present invention is to provide an anti-vibration device having a novel structure that can effectively reduce noise during vibration input by preventing intrusion.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

(Aspect 1 of the present invention)
A feature of aspect 1 of the present invention is that the first mounting member fixed to one member that is vibration-proof connected to the end surface on the small diameter side is independent of the main rubber elastic body having a truncated cone shape. As a separate structure, the second attachment fixed to the other member that is vibration-proof connected to the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body is arranged in a detachable manner. In the vibration isolator provided with a rebound stopper mechanism for buffering a relative displacement amount in the separation direction between the first mounting member and the second mounting member while the member is fixed, A seal that protrudes from at least one side of the first mounting member and the main rubber elastic body at the outer peripheral portion of the overlapping surface of the first mounting member and the main rubber elastic body and extends over the entire circumference in the circumferential direction. The vibration isolator is provided with a lip.

  In the vibration isolator having the structure according to this aspect, the first mounting member is configured as a separate part independent of the main rubber elastic body, and the first mounting member is against the main rubber elastic body. Thus, the structure can selectively take the contact state and the separation state. In the mounted state, generally, a static initial load such as a shared support load of a power unit in an automobile engine mount is applied between the first mounting member and the second mounting member. One mounting member and the main rubber elastic body are brought into contact with each other and overlapped. Under such a mounting state, the seal lip is elastically deformed and closely attached to the outer peripheral portion between the overlapping surfaces of the first mounting member and the main rubber elastic body. Thereby, the space between the overlapping surfaces of the first mounting member and the main rubber elastic body is sealed, and entry of foreign matters such as water and oil is prevented. Therefore, it is possible to effectively prevent the generation of abnormal noise that becomes a problem at the time of vibration input due to water or the like entering between the overlapping surfaces.

  In particular, the seal lip is located only on the outer peripheral portion of the overlapping surface of the first mounting member and the main rubber elastic body, and is provided so as to protrude from one side thereof toward the other side. It is reduced or avoided that it is difficult to obtain the desired spring characteristics in the vibration isolator due to the presence of the seal lip between the one mounting member and the main rubber elastic body.

  More preferably, the seal lip is formed by a shock-absorbing rubber layer that protrudes and adheres to the outer peripheral surface of the first mounting member, as described in aspect 4 below, and the main rubber elasticity of the first mounting member. In the outer peripheral portion where the direct opposed surface to the body is deviated to the outer peripheral side, it is formed to project from the first mounting member side toward the main rubber elastic body side. According to the seal lip having such a structure, even a small protruding height is sufficiently soft, and adverse effects on the main rubber elastic body can be avoided more advantageously, and a more excellent sealing function can be exhibited. In addition, it is possible to reduce or avoid that the required characteristics of the seal lip are hardly exhibited due to the influence of the spring characteristics of the vibration isolator body.

(Aspect 2 of the present invention)
A feature of the second aspect of the present invention is that in the vibration isolator according to the first aspect of the present invention, at least the overlapping surface of the first attachment member and the main rubber elastic body on the inner peripheral side of the seal lip. A textured elastic protrusion is provided on one side.

  In this aspect, the area of the portion where the first mounting member and the main rubber elastic body are overlapped is reduced, and the difference between the overlap when combined due to the buffering action during the overlap based on the elasticity of the elastic protrusions. Sound is more advantageously reduced. In addition, even if water or the like enters between the overlapping surfaces, the contact area between the overlapping surface and water is reduced by the embossed protrusions, and as a result, abnormal noise is more effectively suppressed.

(Aspect 3 of the present invention)
A feature of aspect 3 of the present invention is that, in the vibration isolator according to aspect 1 or 2 of the present invention, the cross-sectional shape of the seal lip is inclined to the inner peripheral side or the outer peripheral side over the entire circumference in the circumferential direction. It is to let you.

  In this aspect, the direction of elastic deformation of the seal lip is made constant toward the inner peripheral side or the outer peripheral side, and the deformation of the seal lip is stabilized. Therefore, the sealing performance and the durability of the seal lip can be further improved. . In addition, since the deformation direction of the seal lip is determined, a change in the spring characteristic of the vibration isolator body accompanying the deformation of the lip is suppressed, whereby the desired spring characteristic can be obtained more stably.

(Aspect 4 of the present invention)
A feature of aspect 4 of the present invention is that in the vibration isolator according to any one of aspects 1 to 3 of the present invention, the seal lip is attached to the main rubber elastic body of the first mounting member. That is, the end surface on the overlapping side is provided at a position deviating to the outer peripheral side.

  In this aspect, the change in the spring characteristics of the vibration isolator caused by the interposition between the first mounting member of the seal lip and the opposing surface of the main rubber elastic body can be suppressed more suitably. Further, when the first mounting member contacts or separates from the main rubber elastic body, the stress concentration of the seal lip is reduced, and as a result, the durability of the lip can be improved. Furthermore, the spring characteristic of the seal lip is set to be soft, so that the seal performance can be further improved.

(Aspect 5 of the present invention)
A feature of the fifth aspect of the present invention is that in the vibration isolator according to any one of the first to fourth aspects of the present invention, at least one of the overlapping surfaces of the first mounting member and the main rubber elastic body. On the other side, there is provided an air vent groove that opens and extends to the overlapping surface and is open to the outer peripheral surface.

  In this aspect, when the first mounting member and the main rubber elastic body are overlapped, the air between the overlapped surfaces is released through the air vent groove, resulting in an air pool between the overlapped surfaces. Abnormal noise is advantageously suppressed.

(Aspect 6 of the present invention)
A feature of aspect 6 of the present invention is that in the vibration isolator according to any one of aspects 1 to 5 of the present invention, on the overlapping surface of the first mounting member and the main rubber elastic body, Both of the overlapping surfaces have a circular shape, one of the overlapping surfaces has a larger diameter than the other overlapping surface, and the seal lip is formed on the outer peripheral portion of the overlapping surface having a small diameter. .

  In this aspect, since the size of the portion where the seal lips are overlapped is sufficiently secured and the elastic deformation of the seal lip is stabilized, the sealing performance can be exhibited more advantageously. Therefore, for example, the first mounting member and the rubber elastic body of the main body may be superposed in a state of being shifted in the direction perpendicular to the axis due to vibration input in an irregular direction or vibration of the vibration isolation target member. The apparatus is also preferably adopted.

(Aspect 7 of the present invention)
A feature of aspect 7 of the present invention is that in the vibration isolator according to any one of aspects 1 to 6 of the present invention, in the overlapping surface of the first mounting member and the main rubber elastic body, The seal lip is formed so as to protrude downward only on the overlapping surface on the side that is positioned upward in the vertical direction when mounted on the vibration isolation target member.

  In this aspect, the generation of abnormal noise due to the penetration of water or the like between the overlapping surfaces of the first mounting member and the main rubber elastic body is further advantageously suppressed. When the seal lip is provided on the outer peripheral portion of the overlapping surface on the side that is positioned downward in the vertical direction under the mounted state on the vibration isolation target member, and water or the like enters the overlapping surface, It is considered that the seal lip acts like a weir and it becomes easy for water or the like to accumulate on the overlapping surface. However, by adopting the configuration of this aspect, the problem of such accumulation is solved. Because.

(Aspect 8 of the present invention)
A feature of the eighth aspect of the present invention is that in the vibration isolator according to any one of the first to seventh aspects of the present invention, the first mounting member has a shaft on a surface facing the main rubber elastic body. A contact portion extending in a right angle direction is provided, and a reinforcing member extending in a direction perpendicular to the axis is fixed to the main rubber elastic body at the end on the small diameter side facing the first mounting member. A coating rubber layer is formed of the main rubber elastic body on the surface of the first mounting member, while the second mounting member protrudes toward the first mounting member and a corresponding contact portion of the first mounting member. A rebound stopper member having a rebound stopper portion that is opposed to the axially outer side is fixed to the first attachment member, and further, the first attachment member is directed from the contact portion toward the rebound stopper portion. The protruding rebound shock absorbing rubber The contact portion is in contact with the rebound stopper portion via the rebound shock absorbing rubber to constitute the rebound stopper mechanism, and the surface of the contact portion facing the main rubber elastic body is covered. A rubber layer is formed of the rebound shock absorbing rubber, and a corresponding contact portion of the first mounting member and the reinforcing member of the main rubber elastic body are overlapped via the respective covering rubber layers, and both of these coverings are covered. The seal lip is integrally formed on at least one of the rubber layers.

  In this aspect, the first mounting member and the main rubber elastic body are overlapped via the contact portion and the reinforcing member, so that the shape of the overlapped portion is stabilized, and the elastic deformation of the seal lip is extended. Therefore, the sealing performance can be further improved. Further, the arrangement of the reinforcing member is effective in improving the durability of the main rubber elastic body and the rebound buffer rubber.

(Aspect 9 of the present invention)
A feature of aspect 9 of the present invention is that in the vibration isolator according to aspect 8 of the present invention, at least a central portion of the facing surface between the contact portion of the first mounting member and the reinforcing member is at least Forming a recess on one side, and providing a bounce cushioning rubber projecting from one side to the other in the central portion in a state of being accommodated in the recess, the first mounting member and the reinforcing member, Before the outer peripheral portion is brought into contact with the covering rubber layer, a bound stopper mechanism is provided which is brought into contact with the central portion through the bound cushion rubber.

  In this aspect, at the time of vibration input, the first mounting member and the main rubber elastic body are prevented from being impactively overlapped, thereby improving the durability, and abnormal noise accompanying the overlap. The occurrence of can be more advantageously reduced.

(Aspect 10 of the present invention)
A feature of aspect 10 of the present invention is that in the vibration isolator according to aspect 8 or 9 of the present invention, the protrusion height of the rebound shock absorbing rubber is changed in the circumferential direction, and the protrusion height is large. The protrusions and the low protrusions having a protrusion height smaller than that of the high protrusions are alternately formed in the circumferential direction.

  In this aspect, a step is provided in the circumferential direction of the rebound shock absorbing rubber, and when the rebound shock absorbing rubber and the rebound stopper portion come into contact, contact with each other in close contact with each other is reduced or avoided. Yes. As a result, the abutting force between the shock absorbing rubber and the stopper portion is dispersed, so that the durability performance can be improved and the abutting sound can be advantageously reduced.

  In particular, when the rebound shock absorbing rubber and the rebound stopper portion come into contact with each other, a gap of a predetermined size is easily provided between the low protrusion and the stopper portion, and air flow is allowed through the gap. Therefore, a contact form such as adsorption caused by all the contact surfaces of the buffer rubber contacting the stopper portion in a close contact state is prevented. Therefore, an abnormal noise that is generated when the buffer rubber and the stopper portion are separated from the adsorbed state can be effectively suppressed.

(Aspect 11 of the present invention)
A feature of aspect 11 of the present invention is that, in the vibration isolator according to aspect 10 of the present invention, a concave groove is formed in the protruding front end surface of the rebound shock absorbing rubber and extending in the radial direction. .

  In this aspect, when the rebound shock absorbing rubber contacts the rebound stopper portion, the air between the contact surfaces is allowed to flow through the concave groove. As a result, contact such as suction between the buffer rubber and the stopper portion is more reliably prevented, and generation of abnormal noise when separating from the suction state between the buffer rubber and the stopper portion can be more advantageously prevented.

  In particular, in this aspect, since the flow of air is ensured by providing such a concave groove, it is not necessary to increase the height difference between the high protrusion and the low protrusion. Therefore, by reducing the height difference, when the rebound shock absorbing rubber and the rebound stopper are in contact, the transition from the contact of the high protrusion to the stopper is smooth and the linear movement is linear. It is also possible to obtain a stable spring characteristic stably.

(Aspect 12 of the present invention)
A feature of aspect 12 of the present invention is that in the vibration isolator according to aspect 10 or 11 of the present invention, the concave grooves are formed at both ends in the circumferential direction of the low protrusion in the rebound shock absorbing rubber. It is in.

  In this aspect, since the high protrusion and the low protrusion are connected to each other via the concave grooves formed at both ends in the circumferential direction of the low protrusion, the height dimension differs particularly in the rebound shock absorbing rubber. The stress concentration at the joint between the high and low protrusions, where stress concentration is likely to occur, is reduced by the elastic deformation of the rubber with the concave groove, which further improves durability. It can be illustrated.

(Aspect 13 of the present invention)
A feature of aspect 13 of the present invention is that, in the vibration isolator according to any one of aspects 10 to 12 of the present invention, the contact portion of the first mounting member has a disk shape. On the other hand, the rebound stopper member is provided with a cylindrical projecting portion extending in the axial direction in a cylindrical shape so as to cover the main rubber elastic body and the corresponding contact portion from the outer peripheral side from the second mounting member, The rebound stopper portion is formed so as to extend radially inward from the projecting distal end portion of the cylindrical projecting portion, and the base end portion of the rebound shock absorbing rubber fixed to the corresponding contact portion is circular when viewed in the axial direction. The rebound stopper is formed at a portion where the tip of the rebound shock absorbing rubber is elliptically annular when viewed in the axial direction and the tip of the rebound shock absorbing rubber is positioned opposite to the long axis. Part In the axial direction and in a direction perpendicular to the axial direction with respect to the corresponding contact portion and the cylindrical protrusion portion, the diameter of the rebound stopper member from the cylindrical protrusion portion is a portion opposed to the short axis direction. The high protrusions are respectively formed in portions that are spaced apart in the direction and abutted in the axial direction only with respect to the corresponding contact portions, and that are opposed to each other in the major axis direction of the rebound shock absorbing rubber, The low protrusions are respectively formed at portions facing the rebound shock absorbing rubber in the short axis direction.

  In this aspect, the long-axis direction spring characteristic is relatively hardened because the long-axis portion of the rebound shock absorbing rubber is in contact with the contact portion and the cylindrical protrusion in the axial direction and the direction perpendicular to the axis. In addition, the short-axis direction spring characteristic in the short-axis direction is made relatively soft because the short-axis direction portion of the rebound cushioning rubber is in contact with only the contact portion. In addition, a high protrusion is formed at a portion facing in the long axis direction, and a relatively strong contact with the contact portion, and a low protrusion is formed at a portion facing in the short axis direction, By relatively weakly abutting the abutting portion, a higher spring in the major axis direction and a lower spring in the minor axis direction can be achieved more advantageously, and the spring ratio in the direction perpendicular to the axis in the vibration isolator is advantageous. Set to Therefore, the major axis direction and the minor axis direction are set according to the spring characteristics in the direction required in the mounted state on the vibration isolation target member, thereby accompanying the contact between the stopper portion and the buffer rubber layer. The generation of abnormal noise is suitably prevented, and even better vibration isolation performance can be exhibited.

(Aspect 14 of the present invention)
A feature of the fourteenth aspect of the present invention is that in the vibration isolator according to any one of the eighth to twelfth aspects of the present invention, in the rebound stopper member, the main rubber elastic body and the main body from the second mounting member. A cylindrical protrusion that extends in the axial direction is provided in a cylindrical shape so as to cover the contact portion from the outer peripheral side, and the outer peripheral surface of the tip of the rebound shock absorbing rubber extends over the entire periphery. In other words, it is positioned so as to be spaced inwardly in the direction perpendicular to the axis from the inner peripheral surface of the.

  In this aspect, by separating the rebound shock absorbing rubber from the cylindrical protrusion in the direction perpendicular to the axial direction over the entire circumference under a non-load input state, the rebound shock absorbing rubber is perpendicular to the axis of the cylindrical protrusion. The durability and load resistance of the rebound shock absorbing rubber can be advantageously ensured as compared with the case where it is pressed.

(Aspect 15 of the present invention)
A feature of the aspect 15 of the present invention is that, in the vibration isolator according to any one of the aspects 8 to 14 of the present invention, the contact portion of the first mounting member has a disk shape. In addition, a thick portion that protrudes toward the rebound stopper portion in the axial direction is formed in at least a part of the circumference of the contact portion, and the contact portion and the rebound stopper portion of the thick portion are formed. The distance in the axial direction is partially reduced.

  In this aspect, by reducing the axial separation between the contact portion and the rebound stopper portion, the elastic deformation of the rebound shock absorbing rubber is limited, and the breakage of the rebound shock absorbing rubber due to excessive elastic deformation is avoided. I can do it. Thereby, the durability of the rebound shock absorbing rubber can be improved.

  As is clear from the above description, in the vibration isolator constructed according to the present invention, based on the elastic deformation of the seal lip provided on the overlapping surface of the first mounting member and the main rubber elastic body, The space between the overlapping surfaces of the first mounting member and the main rubber elastic body is advantageously sealed. In particular, since the seal lip is provided on the outer peripheral portion of the overlapping surface, the first mounting member and the rubber elastic body of the main body are overlapped with each other via the seal lip, thereby affecting the spring characteristics of the vibration isolator. It can be suppressed to a problem-free level. As a result, it is possible to effectively reduce the occurrence of abnormal noise caused by the entry of water or the like between the overlapping surfaces while maintaining the desired spring characteristics.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an automobile engine mount 10 as a first embodiment of the present invention. In the engine mount 10, a first mounting member 12 as a first mounting member and a second mounting member 14 as a second mounting member are mutually connected via a main rubber elastic body 16 as shown in FIG. It has an elastically connected structure. The first mounting bracket 12 is fixed to a power unit as one member to be vibration-proof connected via the power unit side bracket 18, and the second mounting bracket 14 is vibration-proof connected via the outer bracket 20 to the other. By fixing to the vehicle body as the member, the power unit is supported to be anti-vibrated with respect to the vehicle body. 1 and 2 illustrate a state in which the engine mount 10 is not attached to a vehicle. In the present embodiment, in the state in which the engine mount 10 is attached, the shared support load of the power unit is in the mount axial direction (FIG. 1). The first mounting bracket 12 and the second mounting bracket 14 are displaced in a direction approaching each other in the axial direction based on the elastic deformation of the main rubber elastic body 16, and the main vibration is generated. The input direction is substantially the mount axis direction. In the following description, unless otherwise specified, the vertical direction means the vertical direction in FIG.

  More specifically, the first mounting member 12 has a substantially cylindrical shape with a small diameter as a whole, and is provided with a bolt fixing hole 22 in the central portion. Further, the lower end portion in the axial direction of the first mounting bracket 12 is enlarged in diameter so as to spread outward in the direction perpendicular to the axis, and is a contact portion 24 having a large-diameter disk shape. A stopper protrusion 28 is formed on the lower end surface in the axial direction of the abutting portion 24, and protrudes downward in an inverted frustoconical shape at the center. The outer peripheral portion of the stopper projection 28 is an annular flat lower end surface 26.

  Moreover, the 1st attachment metal fitting 12 provided with the contact part 24 and the stopper protrusion 28 is integrally vulcanize-molded with the stopper rubber 30 as FIG. In short, the stopper rubber 30 is formed as a first integrally vulcanized molded product 32 provided with the first mounting bracket 12. The stopper rubber 30 includes a rebound buffer rubber 34 and a bound buffer rubber 36.

  The rebound shock absorbing rubber 34 has a substantially elliptical shape in plan view, and extends upward from the upper end portion of the contact portion 24 and the lower end portion in the axial direction of the first mounting member 12. The inner peripheral surface and the outer peripheral surface of the rebound shock absorbing rubber 34 are curved inclined surfaces that are gradually inclined upward in the direction perpendicular to the axis toward the upper side. Further, based on the fact that the rebound shock absorbing rubber 34 has an elliptical shape, the outer peripheral surface of the rebound shock absorbing rubber 34 in the major axis direction (left and right in FIGS. 4 and 5) is in the minor axis direction (up and down in FIG. 5). Compared to the outer peripheral surface, it is greatly inclined outward in the direction perpendicular to the axis.

  Further, flat contact surfaces 38 are formed on the outer peripheral surfaces of both sides of the rebound shock absorbing rubber 34 in the long axis direction. That is, the outer peripheral surface of the rebound shock absorbing rubber 34 includes a pair of contact surfaces 38 and 38 and has a two-sided width shape and spreads in the circumferential direction. Further, pressure contact lips 40 extending in a substantially semicircular cross section in the axial direction are integrally formed at both end edges in the circumferential direction of each contact surface 38.

  On the other hand, the bound cushion rubber 36 has a substantially truncated quadrangular pyramid shape, and the stopper projection 28 of the first mounting bracket 12 is arranged in an embedded state at the center of the upper end portion thereof, so that the first The mounting bracket 12 is vulcanized and bonded. Further, a concave groove 42 linearly extending in one direction perpendicular to the axis (up and down in FIGS. 3 and 5), which is the short axis direction of the bound cushion rubber 36 and the rebound cushion rubber 34, is formed at the protruding tip of the bound cushion rubber 36. Is formed.

  In addition, a buffer rubber layer 44 as a covering rubber layer integrally formed with the stopper rubber 30 is attached to the lower end surface 26 of the contact portion 24 of the first mounting member 12. The shock absorbing rubber layer 44 extends over the entire lower end surface 26 of the abutting portion 24 around the bound shock absorbing rubber 36 with a substantially constant thickness, and the inner peripheral edge thereof is the base end of the bound shock absorbing rubber 36. The outer peripheral edge portion is rotated from the outer peripheral edge portion of the contact portion 24 to the upper end portion, and is integrally formed with the lower end portion of the rebound shock absorbing rubber 34.

  Furthermore, four bumps 46, 46, 46, 46 are projected from the buffer rubber layer 44. These ridges 46 extend in a substantially constant rectangular or semicircular cross section from the base end portion of the bound cushioning rubber 36 toward the outer peripheral edge of the cushioning rubber layer 44, and at substantially equal intervals in the circumferential direction. It is arranged. In particular, in the present embodiment, a pair of ridges 46 on a line in one direction (right and left in FIG. 5) perpendicular to the axis across the central axis of the first integrally vulcanized molded product 32 that is the major axis direction of the bound cushion rubber 36. , 46 and a direction perpendicular to the axis (in the vertical direction in FIG. 5) along the central axis of the first integrally vulcanized molded product 32, which is the short axis direction of the bounce buffer rubber 36 orthogonal thereto. A pair of ridges 46, 46 are provided on the surface.

  The power unit side bracket 18 is fixed to the first mounting bracket 12. The power unit side bracket 18 is formed using a rigid material such as steel, and a flat plate-shaped horizontal plate portion 48 extending in the horizontal direction (left and right in FIG. 1) and a flat plate extending in the vertical direction (up and down in FIG. 1). The shape has a structure in which the vertical plate portion 50 is integrally formed. The fixing bolt 52 is inserted into the horizontal plate portion 48 of the power unit side bracket 18 and screwed into the bolt fixing hole 22 of the first mounting bracket 12, and the vertical plate portion 50 of the power unit side bracket 18 is attached to a power unit (not shown). The first mounting bracket 12 is fixedly attached to the power unit via the power unit side bracket 18 by being bolted or the like.

  The horizontal plate portion 48 of the power unit side bracket 18 is provided with a large-diameter, substantially bottomed cylindrical bound stopper rubber 51 that opens downward. The upper end surface of the bound stopper rubber 51 is overlapped and fixed to the lower end surface of the horizontal plate portion 48, and the first mounting member 12 is inserted through the center of the bottom portion.

  On the other hand, the second mounting bracket 14 has a thin, substantially large-diameter cylindrical shape, and the lower end in the axial direction of the second mounting bracket 14 is bent into an inner flange shape toward the inner peripheral side. It is structured. The first mounting member 12 is disposed on substantially the same central axis so as to be spaced apart upward in the axial direction of the second mounting member 14. A main rubber elastic body 16 is disposed between the first mounting bracket 12 and the second mounting bracket 14.

  The main rubber elastic body 16 has a substantially truncated cone shape as a whole, and is a rotationally symmetric body having a substantially constant cross-sectional shape over the entire circumference. Further, the entire inner peripheral surface of the second mounting bracket 14 is vulcanized and bonded to the outer peripheral surface of the large-diameter end of the main rubber elastic body 16. Furthermore, a substantially mortar-shaped recess 54 that opens downward is formed on the large-diameter side end (surface) of the main rubber elastic body 16. In particular, in the present embodiment, due to a difference in required spring characteristics between the vehicle front-rear direction and the vehicle left-right direction, a pair of generally straight portions 56, 56 are provided in one direction perpendicular to the axis with respect to the bottom surface of the recess 54. Yes.

  Further, a pressure-receiving metal fitting 58 as a reinforcing member that is disposed so as to be superimposed on the small-diameter side end surface and opens upward is vulcanized and bonded to the small-diameter side end of the main rubber elastic body 16. In short, the main rubber elastic body 16 is formed as a second integrally vulcanized molded product 60 including the second mounting bracket 14 and the pressure receiving bracket 58.

  The pressure-receiving metal fitting 58 is configured by a press-formed product formed by pressing a base plate made of a rigid material such as metal. The pressure receiving fitting 58 has a thin, substantially circular cup shape. In addition, the pressure receiving fitting 58 is integrally formed with an annular plate-shaped flange-shaped portion 62 that extends in the direction perpendicular to the axis at the peripheral edge of the opening of the main body having a circular bottomed cylindrical shape. In particular, in the present embodiment, the inner diameter dimension of the flange-shaped portion 62 (the opening diameter of the main body portion of the pressure-receiving metal fitting 58) is made smaller than the outer diameter dimension of the contact portion 24 of the first mounting bracket 12, and the flange The outer diameter dimension of the shaped part 62 is larger than the outer diameter dimension of the contact part 24.

  Further, an inner rubber layer formed so as to cover almost the entire inner surface of the pressure receiving fitting 58 through a hole penetrating the bottom wall portion of the pressure receiving fitting 58 is integrally formed with the main rubber elastic body 16. ing. Thus, a fitting recess 64 that opens upward is formed inside the pressure receiving metal fitting 58. A fitting recess 64 as a recess formed in the central portion of the opposing surface of the first mounting bracket 12 and the pressure-receiving bracket 58 opens to the small diameter side end (surface) of the main rubber elastic body 16. The bounce buffer rubber 36 has a shape that is substantially larger than the substantially outer peripheral surface shape. In particular, the depth dimension of the fitting recess 64 is made smaller than the height dimension of the bound cushion rubber 36 that protrudes downward in the axial direction from the first mounting member 12.

  Further, the main rubber elastic body 16 wraps around the upper end surface 66 of the flange-shaped portion 62 of the pressure-receiving metal fitting 58 so that the buffer rubber layer 68 integrally formed with the main rubber elastic body 16 is attached. Is formed. The buffer rubber layer 68 as the covering rubber layer has an annular shape that spreads with a substantially constant thickness. Further, the cushion rubber layer 68 is provided with four discharge grooves 70, 70, 70, 70 as air vent grooves. The discharge groove 70 extends in a substantially constant rectangular cross section in the direction perpendicular to the axis, and its bottom (surface) reaches the upper end surface 66 of the flange-shaped portion 62. One end of the discharge groove 70 opens to the inner peripheral edge of the buffer rubber layer 68 and is connected to the fitting recess 64, and the other end of the discharge groove 70 is outside the buffer rubber layer 68. It opens to the periphery and is connected to the outside. In particular, in the present embodiment, the respective discharge grooves 70 are provided at substantially equal intervals in the circumferential direction, and the pair of discharge grooves 70, 70 are on one axis line in the direction perpendicular to the axis that is the opposing direction of the pair of straight portions 56, 56. And another pair of discharge grooves 70, 70 on a line perpendicular to the axis perpendicular thereto, that is, on the opposite direction line of the main rubber elastic body 16 where the pair of straight portions 56, 56 are not provided. It is arranged. Further, the depth dimension of the discharge groove 70 is the same as or slightly smaller than the height dimension protruding downward from the buffer rubber layer 44 of the ridge 46.

  In the first integral vulcanized molded product 32 and the second integral vulcanized molded product 60, the bound cushion rubber 36 is fitted into the fitting recess 64, and the tip of the bound cushion rubber 36 is fitted into the fitting recess. The bounce buffer rubber 36 is compressed and deformed in the axial direction while coming into contact with the bottom of the pressure receiving metal fitting 58 via the rubber at the bottom of the location 64. In other words, the stopper protrusion 28 provided at the center portion of the first mounting bracket 12 is abutted against the bottom of the pressure receiving bracket 58 via the bound cushion rubber 36 and the bottom rubber of the fitting recess 64. In addition, since the outer dimension of the bound cushion rubber 36 is smaller than the inner dimension of the fitting recess 64 by a predetermined amount, the bound cushion rubber 36 is compressed and deformed in the axial direction and is fitted into the fitting recess 64. In this case, a gap 72 is provided between the bound cushion rubber 36 and the fitting recess 64 over the entire circumference.

  Further, each protrusion 46 projecting from the shock absorbing rubber layer 44 of the first mounting bracket 12 is fitted into each discharge groove 70 formed in the shock absorbing rubber layer 68 of the pressure receiving metal fitting 58 (flange-like portion 62). The tip of the ridge 46 abuts on the upper end surface 66 of the flange-like portion 62, and the ridge 46 is compressed and deformed in the axial direction. The width of the protrusion 46 is smaller than the width of the discharge groove 70 by a predetermined amount, so that when the protrusion 46 is compressed and deformed in the axial direction and fitted into the discharge groove 70, the protrusion A gap of a predetermined size is provided between each width direction end portion of 46 and each side wall portion of the discharge groove 70.

  As a result, the lower end surface 26 of the contact portion 24 of the first mounting bracket 12 and the upper end surface 66 of the flange-shaped portion 62 of the pressure receiving bracket 58 are connected to the buffer rubber layer 44 on the first mounting bracket 12 side and the pressure receiving bracket 58 side. The cushion rubber layers 68 are overlapped with each other. Accordingly, the first integrally vulcanized molded product 32 configured to include the first mounting bracket 12 is substantially the same as the second integrated vulcanized molded product 60 configured to include the main rubber elastic body 16. They are superposed from above in the axial direction on the central axis, and assembled in a non-adhesive manner so as to be separated in the axial direction. Further, the bounce buffer rubber 36 is fitted into the fitting recess 64, and the respective ridges 46 are respectively fitted into the predetermined discharge grooves 70, whereby the first integral vulcanized molded product 32 and the second integral vulcanized product are fitted. The sulfur molded product 60 is positioned in the circumferential direction and the direction perpendicular to the axis so as to be prevented from rotating with respect to each other.

  In particular, in the present embodiment, the first mounting bracket 12 and the flange-shaped portion 62 of the pressure-receiving bracket 58 are in contact with the first mounting bracket 12 before the contact between the first mounting bracket 12 and the flange-shaped portion 62 of the pressure-receiving bracket 58. In the central portion of the pressure receiving metal fitting 58, the stopper projection 28 of the first mounting metal fitting 12 abuts against the bottom of the pressure receiving metal fitting 58 via the bounce shock absorbing rubber 36.

  Further, the outer bracket 20 is attached to the first integral vulcanized molded product 32 and the second integral vulcanized molded product 60 in an externally fitted state. The outer bracket 20 has a substantially stepped cylindrical shape having a stepped portion 74 at an axially intermediate portion, and the upper portion sandwiching the stepped portion 74 is a small-diameter cylindrical portion 76 as a cylindrical protruding portion, and the stepped portion. A lower portion sandwiching 74 is a large diameter cylindrical portion 78 having a larger diameter than the small diameter cylindrical portion 76. In addition, a contact piece 80 as an inner flange-shaped rebound stopper portion extending inward in the direction perpendicular to the axis is integrally formed at the upper end portion in the axial direction of the small diameter cylindrical portion 76. Further, a flange-shaped mounting plate portion 82 that extends outward in the direction perpendicular to the axis is integrally formed at the lower end portion in the axial direction of the large-diameter cylindrical portion 78. In addition, flat contacted surfaces 84 are formed at portions of the small-diameter cylindrical portion 76 facing each other in one direction perpendicular to the axis. That is, the inner peripheral surface of the small-diameter cylindrical portion 76 includes a pair of abutted surfaces 84 and 84 and has a two-sided width shape and spreads in the circumferential direction.

  The first integral vulcanized molded product 32 is inserted into the small-diameter cylindrical portion 76 from the opening portion below the outer bracket 20 and accommodated, and the second integral vulcanized molded product 60 is the large-diameter cylinder. The upper end surface of the second mounting bracket 14 is abutted against the stepped portion 74 of the outer bracket 20 and is positioned in the axial direction, and the second mounting bracket 14 is larger than the outer bracket 20. It is press-fitted and fixed to the diameter cylinder part 78. As a result, the first integral vulcanized molded product 32 and the second integral vulcanized molded product 60 are fixedly assembled to the outer bracket 20 in a state where they are superimposed in the axial direction on substantially the same central axis. ing. Further, the mounting plate portion 82 of the outer bracket 20 is bolted to a vehicle body side member (not shown), so that the second mounting bracket 14 is fixed to the vehicle body via the outer bracket 20. Yes.

  In such an assembled state, the contact portion 24 of the first mounting bracket 12 and the contact piece 80 of the outer bracket 20 are spaced apart from each other in the axial direction. Further, the protruding front end surface of the rebound shock absorbing rubber 34 is in contact with the lower surface of the contact piece 80, and is in contact with the contact portion 24 of the first mounting bracket 12 based on the elasticity of the main rubber elastic body 16. Compression deformation is performed between the axially opposed surfaces of the pieces 80. In particular, the abutting piece 80 of the outer bracket 20 is located at a portion where the tip of the rebound cushioning rubber 34 is opposed in the long axis direction (left and right in FIG. 2), that is, a portion provided with the abutting surface 38 and the pressure lip 40. And the small-diameter cylindrical portion 76 in the axial direction and in the direction perpendicular to the axial direction, and spaced apart from the small-diameter cylindrical portion 76 in the radial direction at a position facing the short-axis direction (up and down in FIG. 2). Only the contact piece 80 abuts in the axial direction. As is clear from this, in the present embodiment, the rebound stopper member provided with the abutting piece 80 positioned opposite to the abutting portion 24 of the first mounting bracket 12 in the axially outward direction, The outer bracket 20 is included. Further, the rebound shock absorbing rubber 34 is assembled in a state where the engine mount 10 is not attached to the automobile and is compressed and deformed in advance.

  The small-diameter cylindrical portion 76 of the outer bracket 20 is positioned inside the bound stopper rubber 51 of the power unit side bracket 18, and the contact piece 80 of the small-diameter cylindrical portion 76 and the bottom portion of the bound stopper rubber 51 are arranged in the axial direction. Opposite positions are separated by a predetermined distance.

  An appropriate portion of the small diameter cylindrical portion 76 between the portion where the rebound shock absorbing rubber 34 abuts on the outer bracket 20 and the portion where the second mounting bracket 14 is fixed (the large diameter cylindrical portion 78 and the stepped portion 74) is provided. One or two or more through holes may be provided. As a result, water or the like entering the outer bracket 20 from between the contact piece 80 of the outer bracket 20 and the first mounting member 12 can be discharged to the outside through the through hole.

  Each contact surface 38 provided on the outer peripheral portion of the rebound shock absorbing rubber 34 in the major axis direction (left and right in FIG. 2) is superimposed on each contacted surface 84 of the small diameter cylindrical portion 76 and rebound. The buffer rubber 34 is compressed and deformed in the axial direction or in the direction perpendicular to the axis. Further, each pressure contact lip 40 provided on the rebound shock absorbing rubber 34 is in contact with a portion corresponding to the end in the width direction of the contacted surface 84 in the small diameter cylindrical portion 76 and is compressed and deformed. Thereby, the first integral vulcanized molded product 32 and the second bracket vulcanized molded product 60 fixed to the outer bracket 20 and thus the outer bracket 20 are prevented from rotating in the circumferential direction. It is like that.

  In particular, the lower end surface 26 of the contact portion 24 and the upper end surface 66 of the flange-like portion 62 where the contact portion 24 of the first mounting fitting 12 and the flange-like portion 62 of the pressure-receiving metal fitting 58 of the main rubber elastic body 16 are overlapped. The upper and lower end surfaces 26 and 66 and the buffer rubber layers 44 and 68 attached to the end surfaces 26 and 66 are both in an annular shape, and the buffer rubber layer 44 attached to the lower end surface 26. However, the diameter is larger than the buffer rubber layer 68 attached to the upper end surface 66. Further, the buffer rubber layer 44 on the lower end surface 26 has a slightly smaller diameter than the flange-shaped portion 62. Further, the outer peripheral edge portion of the buffer rubber layer 44 attached to the lower end surface 26 of the contact portion 24 is positioned outward in the direction perpendicular to the axis from the outer peripheral edge portion of the contact portion 24.

  In this case, the buffer rubber layer 44 fixed to the contact portion 24 of the first mounting bracket 12 is attached to the outer peripheral surface of the contact portion 24 and is formed integrally with the stopper rubber 30. . In short, the buffer rubber layer 44 has a larger outer diameter than the outer diameter of the contact portion 24. The buffer rubber 44 is integrally formed with a seal lip 86 at a portion protruding from the contact portion 24 toward the outer peripheral side. As shown in the enlarged view of FIG. 6, the seal lip 86 is located on the outer peripheral portion of the first mounting member 12, and the outer peripheral edge of the shock absorbing rubber layer 44 extends over the entire circumference in the circumferential direction. Are formed continuously. The seal lip 86 is formed with a certain substantially semicircular cross section. In addition, in the outer peripheral part in which each protruding item | line 46 of the buffer rubber layer 44 was provided, the protruding item | line 46 is integrated with the seal lip 86 by extending to the outer periphery part of the buffer rubber layer 44. Since the height dimension H projecting downward from the buffer rubber layer 44 of the seal lip 86 is smaller than the height dimension of the ridge 46 by a predetermined amount, the seal lip 86 is convex in appearance. It is considered that the seal lip 86 continuously formed over the entire circumference is buried in the ridge 46, although it is divided by the stripe 46.

  In particular, in the present embodiment, the outer peripheral edge of the seal lip 86 is positioned at substantially the same position as the outer peripheral edge of the shock absorbing rubber layer 44 in the direction perpendicular to the axis, so that the seal lip 86 is positioned on the outer periphery of the shock absorbing rubber layer 44. The surface does not protrude outward in the direction perpendicular to the axis from the surface. Further, the seal lip 86 has a predetermined width dimension: W with respect to a ring-shaped region having a predetermined width dimension from the outer peripheral edge of the shock absorbing rubber layer 44 toward the inside in the direction perpendicular to the axis. It is arranged so as to extend along the annular region. The width dimension of the seal lip 86: W to the height dimension: H ratio: W / H is appropriately set and changed according to the required seal performance, etc., but preferably 0.5 ≦ W / H ≦ 5, more preferably 1 ≦ W / H ≦ 3.

  The annular region in which the seal lip 86 is disposed is a shock absorbing rubber positioned outward in the direction perpendicular to the axis from the central portion of the shock absorbing rubber layer 44 that is opposed to the contact portion 24 of the first mounting member 12 in the axial direction. Since the seal lip 86 is provided at the outer peripheral portion of the layer 44, the seal lip 86 is provided at a position away from the first mounting member 12 and the contact portion 24 on the outer peripheral side. Further, based on the fact that the outer diameter dimension of the buffer rubber layer 44 is smaller than the outer diameter dimension of the flange-shaped portion 62 of the pressure receiving fitting 58, the seal lip 86 is opposed to the outer peripheral portion of the flange-shaped portion 62 in the axial direction. It is positioned.

  Further, the protruding tip portion of the seal lip 86 having a substantially chevron-shaped cross section is biased to the outer peripheral side (right side in FIG. 6) of the base end portion of the seal lip 86 in the width direction. Thereby, the cross section of the seal lip 86 is shaped to be inclined to the outer peripheral side (right in FIG. 6) over the entire circumference in the circumferential direction.

  Further, the buffer rubber layer 44 radially inward of the seal lip 86 is provided with a plurality of small convex portions 88 as embossed elastic protrusions. The small convex portion 88 has a substantially hemispherical shape, protrudes downward from the buffer rubber layer 44 at a predetermined height dimension: h, and is integrally formed with the buffer rubber layer 44. The plurality of small convex portions 88 are arranged at a predetermined distance in the direction perpendicular to the axis. Further, the ratio of the height dimension of the seal lip 86: H and the height dimension of the small convex portion 88: h: H / h is set based on the desired seal performance, noise suppression effect, and the like. Although not particularly limited, for example, 1 ≦ H / h ≦ 10, and preferably 1.2 ≦ H / h ≦ 5.

  In the automobile engine mount 10 having the above-described structure, the first mounting bracket 12 is fixed to the power unit via the power unit side bracket 18, and the second mounting bracket 14 is connected to the vehicle via the outer bracket 20. When fixed to the body and mounted on the automobile, the first mounting bracket 12 and the second mounting bracket 14 approach each other in the axial direction based on the elastic deformation of the main rubber elastic body 16 due to the shared support load of the power unit. The rebound shock absorbing rubber 34 that has been relatively displaced in the direction and is in contact with the contact piece 80 in a non-mounted state and is compressed and deformed is separated from the contact piece 80 and is in contact with the horizontal plate portion 48 of the power unit side bracket 18. The pieces 80 are relatively displaced in the direction in which they approach each other in the axial direction.

  When a vibration load is input in the axial direction and the first mounting bracket 12 and the second mounting bracket 14 are relatively displaced so as to be separated from each other in the axial direction, the contact portion 24 of the first mounting bracket 12 and the outer The abutment piece 80 of the bracket 20 abuts via the rebound shock absorbing rubber 34. Thereby, the amount of displacement in the direction of separating in the axial direction of the first mounting bracket 12 and the second mounting bracket 14 (rebound direction) is buffered, and the rebound stopper mechanism according to this embodiment is The contact portion 24 of the first mounting bracket 12, the contact piece 80 of the outer bracket 20, and the rebound shock absorbing rubber 34 are configured.

  On the other hand, when a vibration load is input in the axial direction, and the first mounting bracket 12 and the second mounting bracket 14 are relatively displaced so as to approach a predetermined amount or more in the axial direction, the horizontal plate portion 48 of the power unit side bracket 18. The abutment piece 80 of the outer bracket 20 abuts via the bound stopper rubber 51. Thereby, the amount of displacement in the direction approaching in the axial direction of the first mounting bracket 12 and the second mounting bracket 14 (bound direction) is limited in a buffering manner, and the bound stopper mechanism according to this embodiment is The power unit side bracket 18 includes the horizontal plate portion 48, the contact piece 80 of the outer bracket 20, and the bound stopper rubber 51.

  Furthermore, another bound stopper mechanism according to the present embodiment is provided with the stopper protrusion 28 of the first mounting bracket 12, the pressure receiving bracket 58, the bound buffer rubber 36, and the bottom rubber of the fitting recess 64 of the main rubber elastic body 16. It is configured to include. That is, when the shock-absorbing rubber layer 44 attached to the contact portion 24 of the first mounting bracket 12 and the shock-absorbing rubber layer 68 attached to the flange-shaped portion 62 of the pressure-receiving metal fitting 58 come into contact with each other from a separated state. Before the both shock absorbing rubber layers 44 and 68 abut, the stopper protrusion 28 and the pressure-receiving metal fitting 58 abut against each other via the bound shock absorbing rubber 36 and the bottom rubber of the fitting recess 64. As a result, the amount of displacement in the bound direction in the first mounting bracket 12 and the second mounting bracket 14 is limited in a buffering manner.

  In particular, in such an engine mount 10, the first mounting bracket 12 has a separate structure independent of the main rubber elastic body 16 and is disposed so as to be separated from each other. When the bracket 12 and the second mounting bracket 14 are relatively displaced in the rebound direction by a predetermined amount or more, the buffer rubber layer 44 attached to the contact portion 24 of the first mounting bracket 12 and the flange shape of the pressure receiving bracket 58 are provided. The buffer rubber layer 68 attached to the portion 62 is separated from each other, and the fitting recess of the main rubber elastic body 16 with the bound buffer rubber 36 protruding from the first mounting bracket 12 according to the amount of rebound displacement is provided. The 64 bottom rubbers are also separated from each other. As a result, the tensile stress and distortion of the main rubber elastic body 16 are reduced, and excellent durability performance can be obtained.

  By the way, as described above, the lower end surface 26 of the contact portion 24 of the first mounting bracket 12 and the upper end surface 66 of the flange-shaped portion 62 of the pressure-receiving metal fitting 58 are overlapped with each other via the buffer rubber layers 44 and 68. , The structure can be separated from each other. Therefore, for example, when water, oil, or the like enters the outer bracket 20 due to accidental rainfall, water damage, vehicle trouble, or the like, water, oil, or the like between the upper surface 66 and the lower surface 26 overlaps. Concern about intrusion.

  In this case, a seal lip 86 is provided on the outer peripheral portion of the buffer rubber layer 44 on the lower end surface 26 of the contact portion 24, and as shown in FIG. 7, the buffer rubber layer 44 on the lower end surface 26 and the flange are provided. When the cushioning rubber layer 68 on the upper end surface 66 of the shaped part 62 is overlaid, the seal lip 86 is elastically deformed over the entire surface of the cushioning rubber layer 68 on the upper end surface 66 and comes into close contact. As a result, the space between the overlapping surfaces of the lower end surface 26 and the upper end surface 66 is fluid-tightly sealed, and the intrusion of water, oil, or the like between the overlapping surfaces is effectively prevented.

  In particular, the seal lip 86 according to the present embodiment is provided on the outer peripheral portion of the shock-absorbing rubber layer 44 where the abutting portion 24 of the first mounting bracket 12 is dislocated to the outer peripheral side. As a result, the desired spring characteristic exhibited when the first mounting bracket 12 and the pressure-receiving bracket 58 of the main rubber elastic body 16 abut or separate from each other is in contact or separation via the seal lip 86. The large change caused by this is prevented.

  Further, since the cross-sectional shape of the seal lip 86 is inclined to the outer peripheral side over the entire circumference in the circumferential direction, the lower end face 26 of the contact portion 24 of the first mounting bracket 12 and the flange-shaped portion of the pressure receiving bracket 58 When the upper end surface 66 of 62 is overlapped, the seal lip 86 is easily elastically deformed to the outer peripheral side. That is, the direction in which the seal lip 86 is elastically deformed can be stably determined based on the cross-sectional shape of the seal lip 86, and thereby the sealing performance between the overlapping surfaces can be more reliably obtained.

  Furthermore, a seal lip 86 is provided on the buffer rubber layer 44 of the contact portion 24 of the first mounting bracket 12 having a smaller diameter than the buffer rubber layer 68 of the flange-shaped portion 62 of the pressure-receiving metal fitting 58. Therefore, a sufficient contact area of the seal lip 86 is ensured. Therefore, for example, the center axis of both the metal fittings 12 and 14 is displaced due to irregular displacement of the first attachment metal 12 and the second attachment metal 14, so that the seal lip 86 of the pressure-receiving metal fitting 58 (second attachment metal 14). Even when the seal lip 86 is biased toward the central axis and comes into contact with the buffer rubber layer 68, the seal lip 86 is stably elastically deformed, and the desired seal performance can be stably obtained.

  Further, by forming a lip similar to the seal lip 86 on the flange-shaped portion 62 of the pressure-receiving metal fitting 58 and projecting it upward, the above-described effects exhibited when the seal lip 86 is formed can be obtained. It is possible to achieve substantially the same effect. However, particularly in this embodiment, the seal lip 86 is positioned vertically upward in a state where the seal lip 86 is mounted on the automobile on the overlapping surface of the contact portion 24 of the first mounting bracket 12 and the flange-shaped portion 62 of the pressure receiving bracket 58. It is provided only on the buffer rubber layer 44 of the abutting portion 24 that protrudes downward. By adopting such a structure, in addition to the above-described effects, an effect of preventing water and the like from being easily collected on the surface of the buffer rubber layer 68 on the inner peripheral side of the seal lip 86 is also exhibited.

  Therefore, in the engine mount 10 of the present embodiment, the seal lip 86 having the above-described configuration is provided, so that the desired spring characteristics can be maintained and the first seal performance can be maintained based on the excellent sealing performance. Due to the penetration of water or the like between the overlapping surfaces of the contact portion 24 of the mounting bracket 12 and the flange-shaped portion 62 of the pressure receiving bracket 58, the generation of abnormal noise such as “gups” can be advantageously prevented during the overlapping. It is.

  In the present embodiment, a plurality of small convex portions 88 are provided on the inner peripheral side of the buffer rubber layer 44 provided with the seal lip 86, and the buffer rubber layer 44 and the main body rubber on the first mounting bracket 12 side. When the buffer rubber layers 68 on the elastic body 16 side are overlapped with each other, the seal lip 86 abuts against the buffer rubber layer 68 and elastically deforms, and the plurality of small convex portions 88 abut against the buffer rubber layer 68. As a result, the rubber layers 44 and 68 are prevented from being superposed in a close contact state, and the generation of noise due to superposition is further advantageously suppressed. Further, since each small convex portion 88 is a small hemisphere and its spring constant is larger than the spring constant of the seal lip 86, etc., a relatively hard spring characteristic is obtained with respect to the small convex portion 88. Demonstrated. Therefore, it is possible to prevent the spring characteristics of the mount 10 from greatly changing due to the small convex portion 88 being interposed between the contact portion 24 of the first mounting bracket 12 and the flange-shaped portion 62 of the pressure receiving bracket 58. It is done. Thereby, the outstanding noise reduction effect is achieved, maintaining the desired spring characteristic.

  Further, in the present embodiment, the buffer rubber layer 68 on the main rubber elastic body 16 side is provided with a plurality of discharge grooves 70 opened in the direction perpendicular to the axis, so that the buffer rubber layer 68 is on the first mounting bracket 12 side. When it is overlapped with the buffer rubber layer 44, the air between the overlapping surfaces is easily discharged through the discharge groove 70. Therefore, abnormal noise caused by air accumulation between the overlapping surfaces can be advantageously reduced.

  In the present embodiment, the outer bracket 20 has a cylindrical shape, while the rebound shock absorbing rubber 34 has a cylindrical shape at the proximal end portion and an elliptical shape in plan view at the distal end portion. In short, the inclination angle of the rebound cushioning rubber 34 in the radially outward direction in the protruding direction is such that the major axis direction (left and right in FIG. 2) and the minor axis direction (up and down in FIG. 2) are perpendicular to each other. It is set differently depending on the direction. As a result, the contact piece of the outer bracket 20 is located at a position where the tip of the rebound shock absorbing rubber 34 is opposed to the long axis direction (left and right in FIG. 2), that is, a position provided with the contact surface 38 and the pressure contact lip 40. 80 and the small-diameter cylindrical portion 76 are in contact with each other in the axial direction and in the direction perpendicular to the axial direction, and are spaced apart from the small-diameter cylindrical portion 76 in the radial direction at a position facing the short-axis direction (up and down in FIG. 2). Only the contact piece 80 is contacted in the axial direction.

  As a result, the contact force of the rebound shock absorbing rubber 34 against the contact piece 80 and the small diameter cylindrical portion 76 can be made different in the major axis direction and the minor axis direction, thereby specially designing the main rubber elastic body 16. Tuning of the spring ratio in the two directions perpendicular to the axis is facilitated without change, and the spring characteristics in the axial direction of the intended main rubber elastic body 16 are suitably maintained, while the spring ratio in the direction perpendicular to the axis is advantageous. Can be set to Such an automobile engine mount 10 is mounted, for example, so that the short axis direction of the low spring characteristic is the vehicle front-rear direction and the long axis direction of the high spring characteristic is the vehicle left-right direction. The ride comfort performance and running stability can be advantageously improved.

  Next, FIGS. 9 to 10 show a first integral vulcanization molded article 32 that constitutes a part of an automobile engine mount as a second embodiment of the present invention. In the following description, members and parts having substantially the same structure as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment in the drawings, and details thereof are given. The detailed explanation is omitted.

  Specifically, the rebound shock absorbing rubber 34 of the first integrally vulcanized molded product 32 according to the present embodiment includes the high protrusion 90 and the low protrusion 92. In the present embodiment, a pair of high protrusions 90 and low protrusions 92 are provided, and are alternately formed in the circumferential direction of the rebound shock absorbing rubber 34, and the rebound shock absorbing rubber 34 has a substantially constant cross section. It extends in the circumferential direction with a length of about ¼ circumference.

  The inner peripheral surface and the outer peripheral surface of the high protrusion 90 and the low protrusion 92 are curved inclined surfaces that gradually incline outward in the direction perpendicular to the axis upward. Moreover, the upper end surfaces of the high protrusion 90 and the low protrusion 92 have a flat shape over the entire circumferential direction. Furthermore, the outer peripheral end and the inner peripheral end of each protruding tip of the high protrusion 90 and the low protrusion 92 have a curved shape with substantially the same curvature. In addition, the inner and outer peripheral side ends of the protruding tip portion in the middle in the circumferential direction of the high protrusion 90 extend in parallel with the contact surface 38 formed on the outer peripheral surface of the rebound shock absorbing rubber 34.

  In particular, in the present embodiment, the pair of high protrusions 90, 90 are in the major axis direction of the rebound shock absorbing rubber 34 sandwiching the first mounting bracket 12 of the first integrally vulcanized molded product 32 (in FIGS. 9 and 10, The pair of low protrusions 92 and 92 are opposed to each other in the short axis direction (up and down in FIG. 10) of the rebound shock absorbing rubber 34 sandwiching the first mounting bracket 12. ing.

  Here, the high protrusion 90 is made larger than the low protrusion 92 with respect to the height dimension protruding upward from the contact portion 24 of the rebound shock absorbing rubber 34. That is, the axial distance between the high protrusion 90 and the contact piece 80 of the outer bracket 20 is low in the configuration of the engine mount in which the first integrally vulcanized molded product 32 and the outer bracket 20 are assembled. The axial distance between 92 and the contact piece 80 is made smaller.

  The height difference between the high protrusion 90 and the low protrusion 92: h0 is appropriately set and changed according to required spring characteristics, sound reduction, manufacturability, etc., and is not particularly limited. However, h0 is preferably set to 0.3 to 5 mm, and more preferably h0 is set to 0.8 to 1.2 mm. When the height difference h0 is smaller than 0.3 mm, the action of the high protrusion 90 and the low protrusion 92 in contact with each other at the contact between the rebound cushioning rubber 34 and the contact piece 80 is reduced. Alternatively, it is difficult to ensure the size of the gap between the low protrusion 92 and the contact piece 80. In addition, when the height difference h0 is larger than 5 mm, it becomes difficult to smoothly shift from the contact between the high protrusion 90 and the contact piece 80 to the contact between the low protrusion 92 and the contact piece 80. There is a possibility that non-linear spring characteristics, which are undesirable in the required characteristics of the engine mount for automobiles of the embodiment, are easily exhibited.

  Further, as shown in an enlarged view in FIG. 11, an inclined portion 94 and a concave groove are provided between the end portions of the high protrusions 90 and the end portions of the low protrusions 92 that are adjacent to each other in the circumferential direction. 96 is provided. That is, a set of four inclined portions 94 and four concave grooves 96 are provided in the middle portion of the rebound shock absorbing rubber 34 in the short axis direction and the long axis direction, respectively, so that four sets are provided. Further, each set of inclined portions 94 and concave grooves 96 are provided between the high protrusions 90 and the low protrusions 92 having substantially the same circumferential length, so that they are arranged at substantially equal intervals in the circumferential direction. Has been.

  The inclined portion 94 is inclined at a predetermined angle from the end of the high protrusion 90 toward the low protrusion 92, and the surface thereof is substantially flat. In addition, a concave groove 96 is formed between the inclined portion 94 and the low protrusion 92, in other words, each concave groove 96 is formed at both ends in the circumferential direction of each low protrusion 92.

  The concave groove 96 has a substantially semicircular cross section and extends in the radial direction. The concave groove 96 is open at the upper end surface of the rebound shock absorbing rubber 34, and the outer peripheral side end and the inner peripheral end of the upper end surface on which both ends in the radial direction are applied. Open to the part. Further, one end of the concave groove 96 in the width direction (right in FIG. 11) is connected to the lower end of the inclined portion 94 and the other end in the width direction of the concave groove 96 (left in FIG. 11). Is connected to the circumferential end of the low protrusion 92. In particular, in the present embodiment, the end in the width direction of the concave groove 96 connected to the inclined portion 94 is positioned slightly above the end in the width direction connected to the low protrusion 92. Accordingly, the high protrusion 90 and the low protrusion 92 are connected to each other in the circumferential direction via the inclined portion 94 and the concave groove 96. Further, the height difference between the high protrusion 90 and the low protrusion 92: h0 is, for example, h0 = (axial direction from the upper end surface of the high protrusion 90 to the bottom of the concave groove 96, with reference to the center bottom of the concave groove 96. Dimension: h1) − (Axial dimension from the upper end surface of the low protrusion 92 to the bottom of the concave groove 96, that is, the depth dimension of the concave groove 96: h2).

  In the automobile engine mount provided with the first integrally vulcanized molded product 32 having the above-described structure, the tip of the rebound cushioning rubber 34 is mounted in the automobile as in the first embodiment. Further, in a portion opposed to the major axis direction (left and right in FIG. 10), the abutting piece 80 and the small diameter cylindrical portion 76 of the outer bracket 20 are abutted in the axial direction and the axis perpendicular direction, while the minor axis thereof At a portion opposed in the direction (up and down in FIG. 10), it is separated from the small diameter cylindrical portion 76 in the radial direction and is in contact with the contact piece 80 only in the axial direction.

  Further, a pair of high protrusions 90, 90 formed in the major axis direction of the rebound cushioning rubber 34 abuts against the abutting piece 80 and compressively deforms in the axial direction, and the minor axis direction of the rebound cushioning rubber 34. The pair of low protrusions 92, 92 formed in contact with the contact piece 80 are compressed and deformed in the axial direction with a deformation amount smaller than the deformation amount of the high protrusion 90. Accordingly, the contact force of the high protrusion 90 and the low protrusion 92 with respect to the contact piece 80 synergizes with the contact force of the tip of the rebound shock absorbing rubber 34 with the contact piece 80 and the small diameter cylindrical portion 76. Thus, the abutting force of the rebound shock absorbing rubber 34 on the outer bracket 20 in two directions perpendicular to the axis including the major axis direction and the minor axis direction is greatly different. As a result, it becomes easier to tune the spring ratio in the two directions perpendicular to the axis without changing the design of the main rubber elastic body 16.

  Accordingly, an axial (bounce and rebound direction) vibration load is input between the first mounting bracket 12 and the second mounting bracket 14 so that the rebound shock absorbing rubber 34 contacts the contact piece 80 or the small diameter cylindrical portion 76. If the rebound load is relatively large when contacting or separating, the low protrusion 92 contacts the contact piece 80 after the high protrusion 90 contacts the contact piece 80. In short, the contact force between the rebound shock absorbing rubber 34 and the contact piece 80 is dispersed by the rebound shock absorbing rubber 34 being in contact with the contact piece 80 in a stepwise manner from a portion having a large protruding height to a small portion. Therefore, the stress concentration of the rebound shock absorbing rubber 34 can be reduced, the durability performance can be improved, and the contact hitting sound can be advantageously reduced.

  When a relatively small rebound load is input between the first mounting bracket 12 and the second mounting bracket 14, the high protrusion 90 and the contact piece 80 are in contact with each other, and the low protrusion 92 is in contact with the low protrusion 92. The contact piece 80 is opposed to the rebound direction with a predetermined distance. As a result, a gap of a predetermined size is provided between the low protrusion 92 and the abutment piece 80, and air flow is allowed through the gap, so that the entire abutment surface of the rebound buffer rubber 34 abuts. A contact form such as suction by contact with the contact piece 80 in close contact is prevented. Therefore, an abnormal noise that is generated when the rebound buffer rubber 34 and the contact piece 80 are separated from the adsorbed state can be effectively suppressed.

  In other words, in the engine mount according to the present embodiment, the contact with the contact piece 80 is achieved by alternately forming the high protrusions 90 and the low protrusions 92 having different heights in the circumferential direction of the rebound shock absorbing rubber 34. It has a great technical feature in that a plurality of steps are provided in the part and the generation of noise due to contact is suppressed by using these steps.

  And when this inventor repeated the further research and examination, in order to fully exhibit the noise reduction effect, enlarging the level | step difference of the contact part with respect to the contact piece 80 of the rebound shock absorbing rubber 34, That is, it has been found effective to increase the height difference h0 between the high protrusion 90 and the low protrusion 92. However, if the level difference is increased, there is a possibility of adversely affecting the intended spring characteristics in the rebound direction.

  In this respect, in this embodiment, since the height difference between the high protrusion 90 and the low protrusion 92: h0 is set to a relatively small range of 0.5 to 3 mm, The influence on the spring characteristics based on the contact between the second mounting bracket 14 via the rebound shock absorbing rubber 34 is reduced.

  Further, when the rebound shock absorbing rubber 34 and the contact piece 80 are in contact with each other, the difference in height between the high protrusion 90 and the low protrusion 92: between the low protrusion 92 and the contact piece 80 due to the small h0. It is difficult to secure the gap, and the problem that abnormal noise is generated by suction is solved by providing the concave groove 96.

  That is, even when it is difficult to form a gap between the rebound buffer rubber 34 and the contact piece 80, the air between the contact surfaces is discharged through the concave groove 96, and the contact form such as adsorption is effective. Can be prevented. Therefore, even if the height difference between the high protrusion 90 and the low protrusion 92: h0 is set low, there is little trouble with respect to the contact noise, and the contact of the rebound cushioning rubber 34 with the contact piece 80 is rather high. It is possible to smoothly shift from the low protrusion 92 to the low protrusion 92, and the desired linear spring characteristics can be stably obtained.

  In addition, since the concave grooves 96 are provided at both ends of the low protrusion 92 in the circumferential direction, the rubber surfaces of the low protrusion 92 and the high protrusion 90 extend sufficiently continuously in the circumferential direction. As a result, the rebound buffer rubber 34 stably abuts against the abutment piece 80, and the desired spring characteristics can be advantageously exhibited. In addition, since the concave groove 96 is provided at a position avoiding the central portion in the circumferential direction of the high protrusion 90 and the low protrusion 92 that are the main contact portions of the rebound shock absorbing rubber 34 with respect to the contact piece 80. The spring ratio in two perpendicular directions can be set more advantageously.

  Furthermore, in the present embodiment, stress concentration and distortion due to a sudden increase in the difference in height are reduced by connecting the high protrusion 90 and the concave groove 96 via the inclined portion 94. Can be done. In addition, since the inclined portion 94 and the low protrusion 92 are connected via the concave groove 96, stress concentration and distortion of the inclined portion 94 can be reduced. Therefore, durability can be exhibited more advantageously.

  Next, FIG. 12 shows an automobile engine mount 98 as a third embodiment of the present invention. In the following description, members and parts having substantially the same structure as those of the first and second embodiments are denoted by the same reference numerals as those of the first and second embodiments. Therefore, detailed description thereof will be omitted.

  In this automobile engine mount 98, the abutment portion 100 which is integrally formed with the first mounting bracket 12 and has a large-diameter disk shape is thickened in a part of the circumferential direction, and the rebound shock absorbing rubber. 102 is spaced apart from the small-diameter cylindrical portion 76 of the outer bracket 20 over the entire circumference in the direction perpendicular to the axis.

  More specifically, as shown in FIG. 13, the contact portion 100 provided at the lower end portion of the first mounting bracket 12 has a set of thick portions on both sides in one radial direction. Protrusions 104 and 104 are formed. The protrusion 104 protrudes upward in the axial direction from the upper surface of the contact part 100 and is formed to extend linearly in the radial direction with a substantially constant cross-sectional shape. Further, since the lower end surface 26 of the contact portion 100 is a substantially flat surface, as shown in FIGS. 12 and 13, a protruding portion 104 is formed in a part in the circumferential direction, and the contact portion 100. As a result, the thickness of the contact part 100 is changed in the circumferential direction. Thereby, on the circumference of the contact portion 100, the separation distance in the axial direction between the contact portion 100 and the contact piece 80 of the outer bracket 20 in the portion where the protruding portion 104 is formed is the separation distance in the other portion. Has been smaller than.

  Further, the pair of projecting portions 104, 104 in the present embodiment is formed on the upper surface of the contact portion 100 so as to be located on both sides in the major axis direction at the projecting tip portion of the rebound shock absorbing rubber 102 having an elliptical shape. ing. Thereby, the axial protruding dimension on both sides in the long axis direction of the rebound shock absorbing rubber 102 fixed to the contact portion 100 is made smaller than the axial protruding dimension on both sides in the short axis direction.

  On the other hand, in the present embodiment, as shown in FIG. 14, a pair of contact surfaces 38, 38 are formed on the outer peripheral surfaces on both sides in the long axis direction at the protruding tip portion of the rebound cushioning rubber 102, A pair of abutted surfaces 84, 84 are formed on the inner peripheral surfaces of the outer bracket 20 on both sides in one direction perpendicular to the axis. In addition, when the first integrally vulcanized molded product 32 having the rebound shock absorbing rubber 102 is assembled to the outer bracket 20, a pair of contact surfaces 38, 38 formed on the outer peripheral surface of the rebound shock absorbing rubber 102 are provided. Further, the outer bracket 20 is aligned in the circumferential direction with respect to a pair of contact surfaces 84 and 84 formed on the inner peripheral surface of the outer bracket 20.

  Further, the rebound shock absorbing rubber 102 in the present embodiment is a distance between the pair of contact surfaces 38 formed on the outer peripheral surfaces on both sides in the long axis direction, in other words, the diameter of the rebound shock absorbing rubber 102 in the long axis direction. The dimension is made smaller than the rebound shock absorbing rubber 34 shown in the first embodiment. The contact surface 38 is opposed to the contact surface 84 formed on the inner peripheral surface of the outer bracket 20 with a predetermined distance in the direction perpendicular to the axis, and is in contact with the contact surface 38. A gap 106 is formed between the surfaces facing the surface 84. The contact surface 38 and the contacted surface 84 are opposed to each other with a predetermined separation distance. In the present embodiment, the separation distance between the contact surface 38 and the contacted surface 84 (the size of the gap 106). Is d.

  Further, the outer peripheral surfaces on both sides in the short axis direction of the rebound shock absorbing rubber 102 are curved outer peripheral surfaces 108 that are curved in an elliptical arc shape, and the curved outer peripheral surface 108 is a small-diameter cylinder of the outer bracket 20 as in the first embodiment. The rebound cushioning rubber 102 and the small-diameter cylindrical portion 76 of the outer bracket 20 are spaced apart from each other in the minor axis direction with respect to the inner peripheral surface of the portion 76.

  Further, the press contact lips 40 formed at both ends in the circumferential direction of the contact surface 38 in the first embodiment are not formed in this embodiment as shown in FIGS. 15 and 16. Instead, both circumferential edges of each contact surface 38 are directly connected to circumferential edges of each curved outer circumferential surface 108. Therefore, in this embodiment, the rebound shock absorbing rubber 102 is also prevented from indirectly contacting the small diameter cylindrical portion 76 of the outer bracket 20 via the press contact lip 40.

  Accordingly, as shown in FIG. 14, the rebound cushioning rubber 102 in the present embodiment is positioned more radially inward than the small-diameter cylindrical portion 76 of the outer bracket 20 over the entire circumference. The outer peripheral surface of the buffer rubber 102 is spaced inward in the direction perpendicular to the axis over the entire periphery with respect to the inner peripheral surface of the small diameter cylindrical portion 76 of the outer bracket 20.

  Further, in the present embodiment, as shown in FIG. 14, the maximum radius of the rebound shock absorbing rubber 102 (diameter dimension at the boundary between the contact surface 38 and the curved outer peripheral surface 108) is set to r, and the minimum of the outer bracket 20 is set. If the radius (the distance from the center of the outer bracket 20 to the contacted surface 84) is R, then r> R. Therefore, when the rebound shock absorbing rubber 102 and the outer bracket 20 rotate by a predetermined amount in the circumferential direction, the boundary portion between the contact surface 38 of the rebound shock absorbing rubber 102 and the curved outer peripheral surface 108 (the circumferential end of the contact surface 38). Part) is brought into contact with the abutted surface 84 of the outer bracket 20 so that the rebound shock absorbing rubber 102 is prevented from rotating. That is, the first rotation prevention mechanism for preventing the relative rotation of the outer bracket 20 with respect to the first mounting bracket 12 includes the rebound cushioning rubber 102 and the abutting surface 38 based on the two-surface width shape of the outer bracket 20 and the contact. This is realized by the interference (contact) of the contact surface 84.

  Such contact of the rebound shock absorbing rubber 102 with the outer bracket 20 is caused by the rotation of the rebound shock absorbing rubber 102 at which the protrusion length of the rebound shock absorbing rubber 102 toward the gap 106 becomes the maximum, as shown in FIG. Center angle: θ, distance from mount center axis to one contact surface 38: L, width dimension of contact surface 38 in the circumferential direction: 2w, contact surface 38 and contacted surface 84 This is realized by appropriately setting the gap d between the two opposing surfaces so as to satisfy the following expression.

  According to this, the contact surface 38 is brought into contact with the contacted surface 84 by rotating the rebound cushioning rubber 102 with respect to the outer bracket 20 from the predetermined mounting state by an angle of θ / 2 or less.

  Further, as shown in FIG. 18, when the relative rotation amount allowed for the rebound shock absorbing rubber 102 to the outer bracket 20 is set to a specific rotation center angle: α, in other words, the rebound shock absorbing rubber 102 When the contact surface 38 is brought into contact with the contacted surface 84 by rotating relative to the outer bracket 20 from the initial position by the rotation center angle: α / 2, the following equation is satisfied. Set each value of w, L, and d.

  Thus, the rebound shock absorbing rubber 102 (outer bracket 20) is rotated by a predetermined rotation angle: α / 2 from the initial position so that the contact surface 38 and the contacted surface 84 are brought into contact with each other. Can be designed. By setting each value in consideration of the elastic deformation of the rebound shock absorbing rubber 102 formed of a rubber elastic body, rotation prevention by contact can be effectively realized, and within a predetermined allowable rotation range. The rotation of the rebound shock absorbing rubber 102 can be stopped with high accuracy.

  Note that the rotation angle α of the rebound shock absorbing rubber 102 from a predetermined direction: α is appropriately set according to the vehicle on which the engine mount 98 is mounted. The rotation angle α is preferably set within a range of α ≦ 10 °, and more preferably set within a range of α ≦ 5 °. By setting the rotation angle: α in such a range, the circumferential positioning of the first mounting bracket 12 and the second mounting bracket 14 can be achieved with sufficient accuracy, as will be described later. Excellent effects such as ease of attachment to the vehicle can be obtained effectively.

  In the present embodiment, the distance between the facing surfaces of the contact surface 38 and the contacted surface 84 (the size of the gap 106): d is sufficiently small, and preferably 0.1 mm ≦ d ≦ 1. 5 mm, more preferably 0.3 mm ≦ d ≦ 1.0 mm. By setting the gap 106 formed between the facing surfaces of the contact surface 38 and the contacted surface 84 to such a size, relative rotation between the rebound shock absorbing rubber 102 and the outer bracket 20 is advantageously prevented.

  In the automobile engine mount 98 having the structure according to this embodiment, the rebound shock absorbing rubber 102 is mounted on the outer bracket in a state where the first mounting bracket 12 and the second mounting bracket 14 are positioned in a predetermined circumferential direction. The rebound cushioning rubber 102 is separated from the inner bracket 20 by separating the first mounting member 12 relative to the second mounting member 14 from the inner peripheral surface of the outer bracket 20. It is made to contact | abut with respect to a surrounding surface, and the relative rotation of the 1st mounting bracket 12 and the 2nd mounting bracket 14 is restrict | limited. According to this, the first mounting bracket 12 and the second mounting bracket 14 are rotated by the contact between the rebound shock absorbing rubber 102 (contact surfaces 38, 38) and the outer bracket 20 (contacted surfaces 84, 84). Therefore, the rebound shock absorbing rubber 102 is preliminarily placed in the direction perpendicular to the outer bracket 20 in the initial assembly state. Compared with the case where it is pressed, the durability of the rebound shock absorbing rubber 102 can be improved.

  Further, when the rebound shock absorbing rubber 102 is separated from the outer bracket 20 over the entire circumference, when a load in an oblique direction or a direction perpendicular to the axis is input to the rebound shock absorbing rubber 102 in a mounted state on the vehicle. However, it is possible to prevent problems such as cracks in the rebound shock absorbing rubber 102, and to stably position the first mounting bracket 12 and the second mounting bracket 14 in the circumferential direction for a long period of time. It becomes possible to do.

  In addition, by continuously configuring the outer peripheral surface of the rebound shock absorbing rubber 102 with the curved outer peripheral surfaces 108 and 108 and the flat contact surfaces 38 and 38 that are elliptically curved, the rebound shock absorbing rubber 102 can be rebounded by load input in a direction perpendicular to the axis. Even when the rubber 102 is pressed against the outer bracket 20 in a direction perpendicular to the axis, the stress concentration of the rebound shock absorbing rubber 102 can be reduced or avoided, and the durability of the rebound shock absorbing rubber 102 can be improved. I can do it.

  Further, in the present embodiment, the protruding portion 104 is partially formed on the circumference of the abutting portion 100 provided in the first mounting bracket 12, so that the abutting portion 100 and the abutting piece 80 are axially arranged. By changing the distance between the opposing surfaces in the circumferential direction, the protruding dimension in the axial direction of the rebound shock absorbing rubber 102 disposed between the axial direction of the contact portion 100 and the contact piece 80 is partially reduced in the circumferential direction. is doing. Accordingly, the amount of elastic deformation of the rebound shock absorbing rubber 102 that is allowed at the circumferential position where the protruding portion 104 is formed is suppressed to be small, and the rebound shock absorbing rubber 102 is prevented from being broken due to excessive elastic deformation, thereby further improving durability. Improvements can be made.

  Moreover, in the present embodiment, the pair of protrusions 104 and 104 provided on the circumference of the contact part 100 are formed so as to oppose each other in the radial direction, and the protrusions 104 and 104 are provided on the vehicle. The rebound shock absorbing rubber 102 positioned in the left-right direction is formed on both sides in the long axis direction. As a result, it is possible to effectively improve the durability as described above while reducing the deterioration of the ride comfort by forming the protruding portion 104 and limiting the deformation amount of the rebound shock absorbing rubber 102. Note that, as shown in the present embodiment, the protruding portion 104 is formed to extend in one radial direction that is the major axis direction at the protruding tip of the rebound shock absorbing rubber 102 that is elliptical when viewed in the axial direction. However, it is not always necessary to form in the major axis direction, and it is not necessary to form a pair on both sides in one radial direction. That is, it suffices if a protruding portion as a thick portion protruding upward in the axial direction is formed in at least a part of the circumference. Specifically, for example, a pair of protruding portions 104, 104 is also formed in the short axis direction. The protrusions 104, 104, 104, 104 may be formed in a cross shape so as to divide the contact part 100 into four equal parts in the circumferential direction.

  Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention is not limited to specific descriptions in these embodiments, and is based on the knowledge of those skilled in the art. The present invention can be implemented with various changes, modifications, improvements, and the like. Further, it goes without saying that such embodiments are all included in the scope of the present invention without departing from the gist of the present invention.

  For example, the shape, size, structure, number, arrangement and the like of the seal lip 86 are not limited to those illustrated. In the above-described embodiment, the seal lip 86 is provided on the buffer rubber layer 44 on the contact portion 24 side of the first mounting bracket 12. For example, the seal lip 86 is provided on the buffer rubber layer 68 on the flange-shaped portion 62 side of the pressure receiving bracket 58. It is also possible to provide the cushioning rubber layers 44 and 68 on both of them.

  Further, the cushioning rubber layers 44 and 68 provided between the overlapping surfaces of the contact portion 24 of the first mounting bracket 12 and the flange-shaped portion 62 of the pressure-receiving bracket 58 provide the required vibration isolation characteristics and noise suppression effect. The design is appropriately changed accordingly, and it is not an essential member. That is, the seal lip 86 may be provided directly on the contact portion 24 of the first mounting bracket 12, the flange-shaped portion 62 of the pressure-receiving bracket 58, the end surface on the small diameter side of the main rubber elastic body 16, or the like.

  Specifically, for example, as shown in FIG. 8, the contact portion 24 of the first mounting bracket 12 is placed on the flange-shaped portion 62 of the pressure-receiving bracket 58 and the upper end surface 66 of the flange-shaped portion 62. The diameter of the buffer rubber layer 68 is larger than that of the applied buffer rubber layer 68, and a seal lip 86 is protruded from the outer peripheral portion of the buffer rubber layer 68. When the flange-like portion 62 is overlaid, the seal lip 86 may be brought into direct contact with the lower end surface 26 of the contact portion 24 to be elastically deformed.

  In the above embodiment, the seal lip 86 is provided only once around the outer peripheral portion of the shock absorbing rubber layer 44, but a plurality of seal lips 86 may be provided at a predetermined distance in the radial direction. It is also possible to make the shape, size, structure, etc. of the plurality of seal lips different from each other.

  In the above embodiment, the cross-sectional shape of the seal lip 86 is inclined toward the outer peripheral side. However, the seal lip 86 is biased from the center in the width direction of the base end portion toward the inner peripheral side by, for example, The cross-sectional shape of the lip may be inclined toward the inner peripheral side, or may not be inclined by forming a symmetric cross-sectional shape across the center in the width direction of the base end portion.

  In the embodiment, in the fitting recess 64 and the bound cushion rubber 36 constituting the bound stopper mechanism, the bound cushion rubber 36 protrudes from the first mounting member 12 and the fitting recess 64 Although it was provided using the inside of the pressure receiving metal fitting 58 on the small diameter side end face of the main rubber elastic body 16, for example, as shown in FIG. 8, the inside of the contact portion 24 of the first mounting metal fitting 12. In addition, the fitting recess 64 may be provided so as to open downward, and the bounce buffer rubber 36 may be protruded upward from the end surface on the small diameter side of the main rubber elastic body 16. Further, the bound stopper mechanism is not an essential member.

  Furthermore, in the above embodiment, the rebound shock absorbing rubber 34 is substantially elliptical in plan view for the purpose of adjusting the spring characteristics in the vehicle longitudinal direction and the vehicle lateral direction, etc., in the major axis direction with respect to the outer bracket 20. While an example in which the abutment is abutted and spaced apart in the minor axis direction has been shown, the rebound cushioning rubber 34 does not necessarily have an elliptical cylindrical shape, for example, a thick, substantially cylindrical shape, The outer peripheral surface may be brought into contact with the inner peripheral surface of the outer bracket 20 over the entire periphery.

  Furthermore, the fitting recess 64, the bounce buffer rubber 36, the discharge groove 70, which functions as an anti-rotation mechanism that realizes relative positioning of the first mounting member 12 and the main rubber elastic body 16 in the circumferential direction, Forms such as the shape, size, structure, number, and arrangement of the ridges 46 are not particularly limited, and the rotation prevention mechanism is not necessarily required.

  Further, it is desirable that the pressure-receiving metal fitting 58 fixed to the main rubber elastic body 16 is provided in order to improve the durability of the main rubber elastic body 16, but it is not always necessary.

  Further, in the above embodiment, the outer bracket 20 has a cylindrical shape. However, as shown in, for example, Patent Document 2 (Japanese Patent Laid-Open No. 2005-23972), the outer bracket 20 may have a bent plate shape. good.

  In the above embodiment, the present invention is applied to a solid type vibration isolator in which the first mounting bracket 12 and the second mounting bracket 14 are elastically connected by the main rubber elastic body 16. Although an example has been shown, it is of course possible to apply the present invention to a fluid-filled vibration isolator as disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-23972.

  In addition, the shape, size, structure, number, arrangement, and the like of the high protrusion 90 and the low protrusion 92 according to the second embodiment are not limited to those illustrated.

  Further, the inclined portion 94 and the concave groove 96 according to the second embodiment are not essential, and for example, the high protrusion 90 and the low protrusion 92 may be directly connected.

  In addition, the present invention is not limited to the automobile engine mount as illustrated, but can be suitably employed for body mounts, differential mounts, and other various vibration isolators other than automobiles.

It is longitudinal cross-sectional explanatory drawing which shows the engine mount for motor vehicles as 1st embodiment of this invention, Comprising: It is a figure equivalent to the II cross section of FIG. It is II-II sectional drawing in FIG. FIG. 3 is an explanatory plan view showing a second integrally vulcanized molded product constituting a part of the automobile engine mount in FIG. 1. It is a longitudinal cross-sectional explanatory view which shows the 1st integral vulcanization molded product which comprises a part of engine mount for motor vehicles in FIG. 1, Comprising: It is a figure equivalent to the IV-IV cross section of FIG. FIG. 5 is a bottom view illustrating the first integrally vulcanized molded product in FIG. 4. FIG. 6 is a longitudinal cross-sectional explanatory view showing an enlarged main part of the first integrally vulcanized molded product in FIG. 4, corresponding to an enlarged view of the VI-VI cross section of FIG. 5. FIG. 2 is a longitudinal cross-sectional explanatory view showing an enlarged main part of the engine mount for automobiles in FIG. 1. It is longitudinal cross-sectional explanatory drawing which expands and shows the principal part in the engine mount for motor vehicles as another specific example of this invention. FIG. 10 is a longitudinal cross-sectional explanatory view showing a first integrally vulcanized molded product constituting a part of an automobile engine mount as a second embodiment of the present invention, and is a view corresponding to the IX-IX cross section of FIG. 10. is there. FIG. 10 is an explanatory plan view showing a first integrally vulcanized molded product in FIG. 9. It is a figure which expands and shows the XI-XI arrow view in FIG. FIG. 15 is a longitudinal cross-sectional explanatory view showing an automobile engine mount as a third embodiment of the present invention, corresponding to a cross section taken along line XII-XII in FIG. 14. It is a top view which shows the 1st attachment metal fitting which comprises a part of engine mount for motor vehicles in FIG. It is XIIII-XIIII sectional drawing in FIG. FIG. 17 is a longitudinal cross-sectional explanatory view showing a first integral vulcanization molded product constituting a part of the automobile engine mount in FIG. 12, corresponding to the XV-XV cross section of FIG. 16. It is bottom face explanatory drawing which shows the 1st integral vulcanization molded product in FIG. In the engine mount shown in FIG. 12, it is explanatory drawing for demonstrating the conditions which a contact surface and a to-be-contacted surface contact | abut. In the engine mount shown in FIG. 12, it is explanatory drawing for demonstrating the conditions which a contact surface and a to-be-contacted surface contact | abut by predetermined rotation amount.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Engine mount for motor vehicles, 12: 1st attachment metal fitting, 14: 2nd attachment metal fitting, 16: Main body rubber elastic body, 24: Contact part, 26: Lower end surface, 34: Rebound shock absorbing rubber, 36: Bound Buffer rubber, 44: Buffer rubber layer, 58: Pressure fitting, 62: Flange-shaped portion, 64: Fitting recess, 66: Upper end surface, 68: Buffer rubber layer, 70: Discharge groove, 76: Small diameter cylindrical portion, 80 : Contact piece, 86: seal lip, 88: small convex part, 90: high protrusion, 92: low protrusion, 96: concave groove, 104: protrusion

Claims (15)

A first mounting member fixed to one member to be vibration-proof connected to the rubber elastic body having a truncated cone shape on the small-diameter side end surface is superposed so as to be separated as an independent separate structure. And a second mounting member fixed to the other member to be vibration-proof connected to the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body, In the vibration isolator provided with the rebound stopper mechanism for buffering the relative displacement amount in the separation direction between the mounting member and the second mounting member,
In the outer peripheral portion of the overlapping surface of the first mounting member and the main rubber elastic body, it protrudes from at least one side of the first mounting member and the main rubber elastic body and extends over the entire circumference in the circumferential direction. A vibration isolator having a seal lip.   The anti-vibration device according to claim 1, wherein an embossed elastic protrusion is provided on at least one side of the overlapping surface of the first mounting member and the main rubber elastic body on the inner peripheral side of the seal lip.   The vibration isolator according to claim 1 or 2, wherein the cross-sectional shape of the seal lip is inclined toward the inner peripheral side or the outer peripheral side over the entire circumference in the circumferential direction.   The prevention according to any one of claims 1 to 3, wherein the seal lip is provided at a position where an end surface of the first mounting member on the main rubber elastic body is overlapped with an outer peripheral side. Shaker.   The air venting groove that opens and extends to the outer peripheral surface and opens to the outer peripheral surface is provided on at least one side of the overlapping surface of the first mounting member and the main rubber elastic body. 5. The vibration isolator according to any one of 4 above.   In the overlapping surface of the first mounting member and the main rubber elastic body, both overlapping surfaces are circular, and one overlapping surface has a larger diameter than the other overlapping surface, and a small diameter. The vibration isolator according to any one of claims 1 to 5, wherein the seal lip is formed on an outer peripheral portion of the overlapped surface.   In the overlapping surface of the first mounting member and the main rubber elastic body, the seal lip is lowered only on the overlapping surface on the side that is positioned upward in the vertical direction when mounted on the vibration-proof target member. The anti-vibration device according to any one of claims 1 to 6, wherein the anti-vibration device is formed so as to protrude toward the surface.   The first mounting member is provided with a contact portion extending in a direction perpendicular to the axis on the surface facing the main rubber elastic body, and the main rubber elastic body is opposed to the first mounting member. A reinforcing member extending in a direction perpendicular to the axis is fixed to the end portion on the small diameter side, and a covering rubber layer is formed of the main rubber elastic body on the surface of the reinforcing member. A rebound stopper member having a rebound stopper portion that protrudes toward the mounting member side of the first mounting member and is opposed to the corresponding contact portion of the first mounting member in an axially outward direction is fixed. A rebound shock absorbing rubber protruding from the corresponding contact portion toward the rebound stopper portion is fixed to the first attachment member, and the contact portion abuts on the rebound stopper portion via the rebound shock absorbing rubber. Re A wind stopper mechanism is configured, and a coating rubber layer is formed of the rebound cushioning rubber on the surface of the corresponding contact portion facing the main rubber elastic body, and the corresponding contact portion of the first mounting member The reinforcing member of the main rubber elastic body is overlapped via the respective covering rubber layers, and the seal lip is integrally formed in at least one of the both covering rubber layers. Anti-vibration device according to item.   In the central portion of the opposed surface of the first mounting member facing the abutment portion and the reinforcing member, a recess is formed in at least one of the first mounting member and the central portion is accommodated in the recess. A bounce buffer rubber projecting from one side to the other is provided, and the first mounting member and the reinforcing member are brought into contact with each other at the center portion before the bounce buffer rubber is brought into contact with each other via the covering rubber layer. The vibration isolator according to claim 8, further comprising a bound stopper mechanism that is brought into contact with each other through rubber.   The protrusion height of the rebound shock absorbing rubber is changed in the circumferential direction, and a high protrusion having a large protrusion height and a low protrusion having a protrusion height smaller than the high protrusion are alternately formed in the circumferential direction. The vibration isolator according to claim 8 or 9.   The anti-vibration device according to claim 10, wherein a concave groove is formed in the protruding front end surface of the rebound shock absorbing rubber so as to open and extend in a radial direction.   The vibration isolator according to claim 10 or 11, wherein the concave groove is formed at both circumferential ends of the low protrusion in the rebound shock absorbing rubber. While the contact portion of the first mounting member has a disk shape, the rebound stopper member is cylindrical so as to cover the main rubber elastic body and the corresponding contact portion from the outer peripheral side from the second mounting member. A cylindrical projecting portion extending in the axial direction is provided in the shape, and the rebound stopper portion is formed to extend radially inward from the projecting tip portion of the tubular projecting portion,
Furthermore, the base end portion of the rebound shock absorbing rubber fixed to the corresponding contact portion has an annular shape when viewed in the axial direction, and the tip end portion of the rebound shock absorbing rubber has an elliptical ring shape when viewed in the axial direction. One end of the rebound shock absorbing rubber is in contact with the corresponding contact portion of the rebound stopper member and the cylindrical protruding portion in the axial direction and the direction perpendicular to the axis at a portion opposed to the long axis direction. , In a portion opposed to the short axis direction, the rebound stopper member is abutted in the axial direction only with respect to the corresponding contact portion in the radial direction away from the cylindrical protruding portion,
In addition, the high protrusions are respectively formed at portions facing in the long axis direction of the rebound shock absorbing rubber, and the low protrusions are respectively formed at portions facing in the short axis direction of the rebound shock absorbing rubber. The vibration isolator according to any one of claims 10 to 12.   The rebound stopper member is provided with a cylindrical protrusion extending in the axial direction in a cylindrical shape so as to cover the main rubber elastic body and the contact portion from the outer peripheral side from the second mounting member, and the rebound stopper member The outer peripheral surface of the front-end | tip part of a buffer rubber is located inwardly spaced apart from the inner peripheral surface of this cylindrical protrusion part over the perimeter, The prevention as described in any one of Claim 8 thru | or 12 Shaker. The abutting portion of the first mounting member has a disk shape, and a thick portion that protrudes toward the rebound stopper portion in the axial direction is formed in at least a part of the circumference of the corresponding contact portion. The vibration isolator according to any one of claims 8 to 14, wherein a separation distance in the axial direction between the corresponding contact portion and the rebound stopper portion is partially reduced at a portion where the thick portion is formed.

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